Overview

Asbestosis (as-bes-TOE-sis) is a chronic lung disease caused by inhaling asbestos fibers. Prolonged exposure to these fibers can cause lung tissue scarring and shortness of breath. Asbestosis symptoms can range from mild to severe, and usually don't appear until many years after continued exposure.

Asbestos is a natural mineral product that's resistant to heat and corrosion. It was used extensively in the past in products such as insulation, cement and some floor tiles.

Most people with asbestosis acquired it on the job before the federal government began regulating the use of asbestos and asbestos products in the 1970s. Today, its handling is strictly regulated. Acquiring asbestosis is extremely unlikely if you follow your employer's safety procedures. Treatment focuses on relieving your symptoms.

Symptoms

The effects of long-term exposure to asbestos typically don't show up until 10 to 40 years after initial exposure. Symptoms can vary in severity. Asbestosis signs and symptoms may include:

  • Shortness of breath
  • A persistent, dry cough
  • Loss of appetite with weight loss
  • Fingertips and toes that appear wider and rounder than normal (clubbing)
  • Chest tightness or pain

When to see a doctor

If you have a history of exposure to asbestos and you're experiencing increasing shortness of breath, talk to your doctor about the possibility of asbestosis.

Causes

If you are exposed to high levels of asbestos dust over a long period of time, some of the airborne fibers can become lodged within your alveoli — the tiny sacs inside your lungs where oxygen is exchanged for carbon dioxide in your blood. The asbestos fibers irritate and scar lung tissue, causing the lungs to become stiff. This makes it difficult to breathe.

As asbestosis progresses, more and more lung tissue becomes scarred. Eventually, your lung tissue becomes so stiff that it can't contract and expand normally.

Smoking appears to increase the retention of asbestos fibers in the lungs, and often results in a faster progression of the disease.

Risk factors

People who worked in mining, milling, manufacturing, installation or removal of asbestos products before the late 1970s are at risk of asbestosis. Examples include:

  • Asbestos miners
  • Aircraft and auto mechanics
  • Boiler operators
  • Building construction workers
  • Electricians
  • Railroad workers
  • Refinery and mill workers
  • Shipyard workers
  • Workers removing asbestos insulation around steam pipes in older buildings

Risk of asbestosis is generally related to the amount and the duration of exposure to asbestos. The greater the exposure is, the greater the risk is of lung damage.

Secondhand exposure is possible for household members of exposed workers, as asbestos fibers may be carried home on clothing. People living close to mines may also be exposed to asbestos fibers released into the air.

In general, it's safe to be around materials that are made with asbestos as long as the asbestos fibers are contained. This prevents them from getting into the air and being inhaled.

Complications

If you have asbestosis, you're at increased risk of developing lung cancer — especially if you smoke or have a history of smoking. Rarely, malignant mesothelioma, a cancer of the tissue around the lung, can occur many years after exposure to asbestos.

Prevention

Reducing exposure to asbestos is the best prevention against asbestosis. In the United States, federal law requires employers in industries that work with asbestos products — such as construction — to take special safety measures.

Many homes, schools and other buildings built before the 1970s have materials such as pipes and floor tiles that contain asbestos. Generally, there's no risk of exposure as long as the asbestos is enclosed and undisturbed. It's when materials containing asbestos are damaged that there's a danger of asbestos fibers being released into the air and inhaled.

Dec. 27, 2019
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